Heavy duty battery pack



FIG. 1 is a rear view of the heavy duty battery pack showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a right front perspective view thereof; and,

FIG. 6 is a left rear perspective view thereof. 

CLAIM The ornamental design for a heavy duty battery pack, as shown. 